<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script>
          //函数是可以相互调用的
        function fn1() {
            console.log(11);
            fn2();
        }
        fn1();
        function fn2() {
            console.log(22);
        }
    </script>
</head>
<body>

</body>
</html>